SYNONYMY NOTE: an agent is, generally, a person or thing that acts or is capable of acting, or, in this comparison,
one who or that which acts, or is empowered to act, for another [the company's agent]; factor now usually denotes an agent for the sale of goods; a , deputy is a public official to whom certain authority has been delegated by superiors; ,
proxy implies the delegation of power to substitute for another in some formal or ceremonial
detail [some stockholders vote by proxy]